    import java.util.Scanner;

    public class TestD {
        public static void main(String[] args) {
            double a;
            Scanner sc = new Scanner(System.in);
            while (sc.hasNext()){
                a = sc.nextDouble();
                a = Math.abs(a);
                System.out.printf("%.2f",a);
                System.out.println();
            }
        }
    }
